Preheat oven to 425F.,In a medium skillet, saute onions in butter over medium-high heat until golden,about 10 minutes, set aside.,In a medium bowl, mix egg and water.,Stir in corn.,Stir in dry milk and muffin mix until blended.,Stir in onions.,Spread in mix into a greased 8x8 inch baking dish.,______,Bake for 25-30 minutes or until puffed and golden.,Let stand 10 minutes and cut into squares.